WIT Press


A New Normal Mode Program SWAMP As A Tool For Modeling Scattering Effects In Oceanic Waveguides

Price

Free (open access)

Paper DOI

10.2495/AC030261

Volume

69

Pages

10

Published

2003

Size

422.21 kb

Author(s)

N. A. Sidorovskaia

Abstract

A new normal mode program SWAMP as a tool for modeling scattering effects in oceanic waveguides N.A. Sidorovskaia Physics Department, UL Lafayette, USA Abstract A recently developed normal mode numerical technique implemented in the computer program "SWAMP" (Shallow Water Acoustic Modal Propagation: on a web at http://www.ucs.louisiana.edu/ "nxs7560), which offers a unique opportunity to couple propagation and scattering phenomena in oceanic waveguides with complicated multi-layered bottom structure and variable sound speed profile in the water column, is discussed. The SWAMP algorithm for obtaining the modal solution for an arbitrary waveguide is based on a warping matrix transformation of the solution of an isovelocity (reference) waveguide to one of an arbitrary sound speed profile. It is shown that the resulting modal functions for an azimuthally symmetrical cylindrical variable-sound-speed waveguide can be transformed into the superposition of spherical harmonics suitable for mapping inci

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